Compilare: main.cpp: In function 'int main()': main.cpp:93:32: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 93 | if (ans.size() == n - 1) | ~~~~~~~~~~~^~~~~~~~ main.cpp: In function 'bool u(long long int, long long int)': main.cpp:56:1: warning: control reaches end of non-void function [-Wreturn-type] 56 | } | ^